Number1=0
Number2=10.1
Number3=-10.6
String1="变量的练习"
print(Number1)
print(Number2)
print(Number3)
print(String1)
#print的拼接通过符号,
print(String1,Number1,Number2,Number3)
Number2=Number2-5
#重新定义Number2的值,假设原来所代表含义是钱包余额，付款5元，此时为找零
